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JAK1 Is a Novel Target of Tumor- and Invasion-Suppressive microRNA 494-5p in Colorectal Cancer

Nitin Patil1, Omar G Abdelrahim1, Jörg H Leupold1

  • 1Department of Experimental Surgery-Cancer Metastasis, Mannheim Medical Faculty, Ruprecht-Karls University of Heidelberg, 69047 Heidelberg, Germany.

Cancers
|January 11, 2024
PubMed

Insights

MicroRNA-494-5p suppresses colorectal cancer (CRC) growth and metastasis by inhibiting Janus kinase 1 (JAK1) expression. This finding supports miR-494-5p as a potential tumor suppressor in CRC progression.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Previous studies suggested a link between microRNA-494-5p (miR-494-5p) and colorectal cancer (CRC) metastasis.
  • Functional studies elucidating miR-494-5p's role in CRC are limited.

Purpose of the Study:

  • To investigate the functional role of miR-494-5p in colorectal cancer.
  • To determine if miR-494-5p targets Janus kinase 1 (JAK1) and affects CRC cell behavior.

Main Methods:

  • In silico analysis to identify potential miR-494-5p binding sites in JAK1 3'UTR.
  • Luciferase reporter assays to confirm direct binding of miR-494-5p to JAK1.
  • Overexpression of miR-494-5p in CRC cell lines to assess effects on JAK1 expression, proliferation, migration, and invasion.
  • Western blot analysis to evaluate protein expression and phosphorylation.
  • Kaplan-Meier plotter analysis for patient survival data.

Main Results:

  • miR-494-5p directly binds to the 3'UTR of JAK1, reducing its expression.
  • Overexpression of miR-494-5p significantly inhibits CRC cell proliferation, migration, and invasion.
  • miR-494-5p suppresses IL-4-induced signaling pathways involving JAK1, STAT6, and AKT.
  • High JAK1 expression correlates with reduced patient survival in CRC.

Conclusions:

  • miR-494-5p acts as a tumor suppressor in colorectal cancer by inhibiting JAK1 expression at the translational level.
  • miR-494-5p effectively inhibits CRC cell migration and invasion, key early steps in metastasis.
  • These findings highlight miR-494-5p as a potential therapeutic target for CRC treatment.
Keywords:
JAK1colorectal cancerinvasionmiR-494-5pmiRNAsmigration

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